The thrust from the North-West :
* One of the most well-known scholars on Buddhism and a highly reputed historian, B. M. Barua, stated boldly, in his book, Indian Culture (vol. X, p. 34.) :
"To me Candragupta was a man of the Uttarapatha or Gandhara if not exactly of Taksashila. His early education, military training and alliances were all in that part of India. He added the whole of the province of Gandhara and the surrounding tribal states (Punjab and N.W. frontier province) to the growing Magadha empire together with the territories ceded to him by Seleukus...."
* B. K. Barua and H. C. Seth (Indian Historical Quarterly, vol. 8, 1932.) place the Mauryas in the North-West.
* Please read :
"Mauryan coins have the symbol of the sun, a branch, a humped bull and mountain.
All these are pre-eminently Scythian MassaGetae icons who were sun worshippers with the high mount symbolizing earth and the irregular curving lines alongside it symbolizes water.
The tree branch is a symbol of productivity of the earth - agriculture and soldiering were the traditional "noble" occupation of Sakas.
The historians of Darius record that when he attempted to attack the Scythian MassaGetae (an old-Iranian culture of central Asia) along the Black sea in the 5th century BC, the Saka kings swore by the sun god and refused to surrender "earth and water".
The primordial Scythian Massagetaeans' religion was that of the original Iranic race, namely monotheist sun-worship, which they and their Maga priests carried wherever they migrated. It's a well-known fact that they even used to sacrifice horses in sun's honour.
D. B. Spooner who evacuated Pataliputra was struck by his findings and writes in his article "The Zoroastrian Period of Indian History" as follows: "For Chandragupta' s times, the evidences are more numerous and more detailed, and indicate a following of Persian customs all along the line - in public works, in ceremonial, in penal institutions, everything".
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Sincerely !!